Liviu-Dieter Nisipeanu (born August 1, 1976) is a Romanian chess player. In the July 2005 FIDE list, he had an Elo rating of 2679, making him the top Romanian player and number twenty-five in the world. Noted for his risky, almost paradoxical play; he is frequently called a student of Mikhail Tal.

Nisipeanu won the European Chess Championships 2005 on July, 1st in Warsaw with 10 points out of 13 games. A half point ahead of runner-up Teimour Radjabov from Azerbaijan.